You have used character data somewhere it is not permitted to appear.
Mistakes that can cause this error include putting text directly in the
body of the document without wrapping it in a container element (such as a
<p>aragraph</p>) or forgetting to quote an attribute value (where
characters such as "%" and "/" are common, but cannot appear without
surrounding quotes).
how about adding...
This is also caused by using xhtml non closing tags while using a html
dtd. eg <br/>
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